> so if you counted flashes per (say) 5 minute period, you would have about a
> 12W accuracy - which should be plenty accurate enough to know whats going
> on.

> Generally a house will run at 50 - 100W background (a couple TV's etc on
> standby, a PVR, a modem, perhaps a second wireless router, clock radio's
> etc), if a fridge kicks in it that will be another 100 - 150W, and as soon
> as a TV goes on, heaters cooking appliances etc it sky-rockets from there.

> Do you have solar panels? I haven't checked mine yet, but i suspect the same
> LED flashed for import and export, so this could make things a little more
> complex.

> On Monday, July 9, 2012 3:40:19 PM UTC+9:30, Ken wrote:

>> Sorry, yes Scott.
>> So at 100W load, the updates would be every 36 seconds.  (Please check my
>> maths.)
>> It is probable that most of the time I'll be using enough juice to get
>> reasonably short update periods.
>> I'll give it a go to find out.

>> On 9 July 2012 15:27, Scott B <solar.sen...@gmail.com> wrote:

>>> are you sure its one pulse per kWh? not 1 pulse per Wh?

>>> On Monday, July 9, 2012 11:57:59 AM UTC+9:30, Ken wrote:

>>>> Well I've moved into my new house and had a peek at the electricity
>>>> meter.
>>>> It has a one-pulse-per-kwhr LED, and another one whose purpose I'm not
>>>> too sure of.

>>>> But when I think on it more, while it would be nice to graph the exact
>>>> usage over time, the LED isn't going to update too often under light
>>>> load/usage.

>>>> So I'd still like a power reading that updates frequently.
>>>> The unit I have does it every 6 seconds, but isn't hugely accurate, and
>>>> doesn't interface usefully to a computer.  (Only gives a history, in a
>>>> proprietary format.)

>>>> I think the electronics and maths etc are too much hassle to do from
>>>> scratch (for a lazy person like me).
>>>> -Needs to measure 3 phases of current, power factor, voltage, calculate
>>>> instantaneous power on each, then send to a remote point.

>>>> So if anyone is aware of any gear that can be bought for this purpose
>>>> (at hobby type prices), I'd like to hear from you.
>>>> Failing a bought unit, I'd need a fairly fast micro to measure all those
>>>> values, compare phase and calculate, 3 times over.

>>>> Ken.

>>>> On 28 June 2012 13:23, Ken <k...@waggies.net> wrote:

>>>>> Does anyone have experience with modern electicity meters?

>>>>> Silicon Chip magazine has a circuit-ideas article on reading, sending,
>>>>> & displaying, the one pulse per watthour LED on electricity meters.
>>>>> (I didn't know there was one!)
>>>>> It uses a Picaxe to send over 433MHz, and display on 7-segment digits.

>>>>> My current electricity meter has the old turning disk.
>>>>> The one in my new house is modern.

>>>>> I have a gadget that measures the currents in three phases and sends to
>>>>> a console inside.
>>>>> But it is not too accurate (doesn't measure voltage or current phase),
>>>>> and doesn't connect to a PC too well.

>>>>> I feel a project coming on.

>>>>> Ken.

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